PSB’s award-winning wireless active noise cancelling headphones are reborn as the M4U8 MKII with exciting feature upgrades. Enhanced battery life and the latest noise cancelling technology will improve mobile listening; while Audiodo Personal Sound will compensate for your unique hearing abilities; letting you fully experience PSB Speakers’ renowned sonic signature. Work or play; PSB Speakers’ headphones are designed for comfortable and noise-free extended listening. Key Features: - High-performance wireless noise cancelling headphones - PSB’s award-winning “true-to-nature” sound signature - All-digital adaptive noise cancelling (ANC) for pure noise-free listening - Custom audio calibration with Personal Sound by Audiodo™ - New PSB headphone app for more control and personalization - Up to 25 hours of battery life for all-day wireless playback - Powerful rechargeable battery with a USB C charger - Compatible with iOS and Android devices What's in the box? - Active Noise Cancelling Headphones